Radar antenna
Disclosed is a radar antenna having an antenna and a waveguide that are coupled using a jig on which a plurality of alignment pins are arranged, and thus minimizing tolerance during assembly. The disclosed radar antenna comprises: an alignment jig having a plurality of alignment pins; a circuit board having a plurality of first alignment holes through which the plurality of alignment pins penetrate, and being stacked on the upper surface of the alignment jig; a waveguide having a plurality of second alignment holes through which the plurality of alignment pins penetrate, and being stacked on the upper surface of the circuit board; and an antenna having a plurality of third alignment holes through which the plurality of alignment pins penetrate, and being stacked on the upper surface of the waveguide.
1 . A radar antenna comprising:
an alignment jig on which a plurality of alignment pins are formed;
a circuit board on which a plurality of first alignment holes being respectively penetrated by the plurality of alignment pins are formed, and which is stacked on an upper surface of the alignment jig;
a waveguide on which a plurality of second alignment holes being respectively penetrated by the plurality of alignment pins are formed, and which is stacked on an upper surface of the circuit board; and
an antenna on which a plurality of third alignment holes being respectively penetrated by the plurality of alignment pins are formed, and which is stacked on an upper surface of the waveguide.
2 . The radar antenna of claim 1 , wherein the plurality of alignment pins have a height that exceeds a value obtained by adding a thickness of the circuit board and a thickness of the waveguide to each other.
3 . The radar antenna of claim 1 , wherein the plurality of alignment pins comprise:
a plurality of first alignment pins having a first diameter; and
a plurality of second alignment pins having a second diameter that is smaller than the first diameter.
4 . The radar antenna of claim 3 , wherein the plurality of first alignment pins are disposed adjacent to an outer periphery of the alignment jig, and
the plurality of second alignment pins are disposed between the plurality of first alignment pins.
5 . The radar antenna of claim 3 , wherein the first alignment holes include a plurality of the (1-1)-th alignment holes having a third diameter and a plurality of the (1-2)-th alignment holes having a fourth diameter that is smaller than the third diameter,
the second alignment holes include a plurality of the (2-1)-th alignment holes having a fifth diameter and a plurality of the (2-2)-th alignment holes having a sixth diameter that is smaller than the fifth diameter, and
the third alignment holes include a plurality of the (3-1)-th alignment holes having a seventh diameter and a plurality of the (3-2)-th alignment holes having an eighth diameter that is smaller than the seventh diameter.
6 . The radar antenna of claim 5 , wherein the plurality of first alignment pins penetrate the plurality of the (1-1)-th alignment holes, the plurality of the (2-1)-th alignment holes, and the plurality of the (3-1)-th alignment holes, and
the plurality of second alignment pins may penetrate the plurality of the (1-2)-th alignment holes, the plurality of the (2-2)-th alignment holes, and the plurality of the (3-2)-th alignment holes.
7 . The radar antenna of claim 1 , wherein the waveguide comprises:
a lower plate stacked on the upper surface of the circuit board; and
an upper plate stacked on the upper surface of the lower plate.
8 . The radar antenna of claim 7 , wherein a radio wave transport path is formed inside the waveguide, and
the radio wave transport path comprises:
a through-hole vertically penetrating the lower plate;
a through-hole vertically penetrating the upper plate; and
a groove in a horizontal direction formed on a lower surface of the upper plate.
9 . The radar antenna of claim 1 , wherein the antenna comprises:
a plurality of slits forming at least one slot group that radiates or receives radio waves;
a plurality of the (3-1)-th alignment holes disposed adjacent to a first side and a second side opposite to the first side among an outer periphery of the antenna; and
a plurality of the (3-2)-th alignment holes having a diameter that is smaller than a diameter of the plurality of the (3-1)-th alignment holes, disposed between the (3-1)-th alignment holes disposed adjacent to the first side and the (3-2)-th alignment holes adjacent to the second side, and disposed adjacent to the slot group that forms the plurality of slits.